Wall-insulator.



No. 870,187. PATENTED NOV. 5, 1907.

F. M. LOGKE.

WALL INSULATOR.

APPLICATION FILED JULY 18, 1907.

' passeswith one or iuore insulator disks of considerably FRED LooKE; OF VICTOR, NEW YORK? Y WALL-INSULATOR. a v

Specification of Letters Patent. v i 1 907 Lpplicatidn filed July 18. 1907. Serial No. 384614 the accompanying drawings, is a full, clear, and exact description.

7 This invention relates to certain improvements in wall insulators adapted to be used as an entrance insulator into a building by inserting the same through a suitable hole or opening in the wall and attaching it at the periphery.

The specific object of my present invention is to ma terially increase the electro static capacity of the insulater and thereby preveht surface leakage of the current from the conductor to the surrounding wall by surroimdingthe entrance tube through which the wire greater cross sectional area than that of the tube for the purpose of reducing the liability of static discharges due to conduction or creeping of the current over the insulator surfaces and at the same time to provide ample air space orgap between the arcing points of the insulator to effectually resist such arcing.

. A'iurther object is to arrange two or more concavoconvex disks around and upon the center entrance tube with their convex facesin ju'xta-position to afford an intervening air space gradually increasing in width from the center toward the peripheries of said disks so as to more effectually resist arcing of any current leakage from one sui'face to the other at their junction with the wall. I

' Other objectsand. uses will be brought out in the fol lowing description.

' In the drawings Figures 1, '2, 3, and/i are sectional views of modified forms of my improved wall insulator,

all of which are adapted forhigh voltage electric conductors. In each of these'modifications, I have shown an entrance tube 1' of insulating material such as porcelain having a central. lengthwise opening -2' for the reception of the line wir enot shovm, said tube be ing.corrugated longitudinally forming a series of annu-.

lar ribs -3 and intervening spaces 1 for the purpose of increasing the electro static capacity or surface of the insulator and resisting as far as possible surface leakage and electro static stresses to which the tube'is subjected. V I

In Fig. 1 I have shown the central portion of the tube as surrounded by a pair of concavo-convex disks 5 and -6 of insulating material such as porcelain having their. convex iaces arranged in juxtaposition, the disk --5 being provided with a central hub 7 which is fitted upon and preferably secured to the centml portion of the entrance tube 1 by an interposed cementitious bond -8. The disk 6 is, in this instance, fitted upon the hub -7- of the insulator 5- and may be secured thereto by any suitable. cementitious substance whereby the disks are firmly united to each other. Each of these disks 5 and 6 is provided with a series of concentric flanges S% spaced apart forming intervening annular spaces 10for the purpose of further increasing the surface area of the disks and affording ample intervening air space be-' tween the arcing points of the flanges and entrance tube to more effectually resist arcing of the current from the conductor to the surrounding wall. These flanges 9 are preferably formed on the concave sides of the disks 5 and -6 and their outer edges are, therefore, disposed atsubstantially right angles to the axis of the tube 1 and in this instanceare disposed within the plane 01' the outer edges of said disks which latter are preferably beaded and over hang the flanges --9' to protect them as far as practical from accumulations of moisture thereon; The wall insulator shown in Fig. 2

is substantially the same as that shown in Fig. 1 except that the disks as -5 and 6- are unprovided with annular flanges 9 and spaces 10-, that is the inner and outer faces are substantially plain but in both instances the convex faces are arranged in juxta-position leaving an intervening air space which gradually increases in width from the center toward the periphery thereby materiallywincreasing the electric resistance of the insulator and also increasing the arcing distance between the disks as they approach the periphery or wall of the opening in which the insulators are mounted In Fig. 3 I have shown a single concavo-convex disk -51 as surrounding the entrance tube 1 and ii substantially the same as the disk 5 shown in Fig. 2 and may be used in connection with conductors of lower voltage than that for which the insulator shown in Figs. 1, 2 and 4 are intended.

In Fig. 4 I have shown a pair of concavo-convex insulators 12 and 13 which are quite similar in con struction to those shown in Fig. 2 except that their pe- I ripheries are provided with over turned rolls or annular flanges l4- leaving an intervening air space l5 between the flanges 14 and main body of the insulator, the object of which is to increase the surface area of the disks so as to more effectually neutralize any tendency toward surface leakage of the current from the conductor to the surrounding walls of the opening in which the insulator is located. I

What I claim is:

1. A wall insulator comprising an entrance tube, and a concavoconvex.disk surrounding the central portion of the tube.

2. A wall insulator comprising an entrance tube, and a pair of disks surrounding the central portion of the tube and-having convex meeting faces.

3. A wall insulator comprising a corrugated entrance tube, and a pair of disks arranged side byside upon the\ central portion of. the tube and having the outer edges of pair of concavmconvex disks surronndlng the tube andeach 10 the meeting faces spaced apart. 1 provided with a seriesof concentric annular flanges.pro-

4. A wall in snlator comprising an'entranoe tube, and a jecting from their concave faces. pair of, concavo-convendisks surrounding the fube with In witness whereof I have hereunto set my hand this their convex faces in jnxta-position. 15th day ofJuly, 1907. Y

5. A well insulator comprising an entrance tube, and a FRED LOCKE concavo-convex disk surrounding the entrance tube and v Witnesses: 7 provided with a laterally projecting annular ,flange. W. A. HIGniBO'rHAM;

; 6. A wall insulator comprising an'entrance tube and a C. A; Mooma. 

